Abu Abdullah (asws) said, ‘I asked him (asws) about the earth, which thing does it rest upon? He (asws) said: ‘It is upon the whale’. I said, ‘So the whale, which thing does it rest upon?’ He (asws) said: ‘Upon the water’. I said, ‘So the water, upon which thing does is rest upon?’ He (asws) said: ‘Upon a rock’. I said, ‘So upon which thing does the rock rest upon?’ He (asws) said: ‘Upon the horns of a bull’ I said, ‘So upon which thing does the bull rest upon?’ He (asws) said: ‘Upon the mist’. I said, ‘So upon which thing does the mist rest upon?’ He (asws) said: ‘This is how far knowledge of scholars is permitted (to reveal) and beyond this is straying’.